Naturally, although GT3 racecars are more structurally akin to road cars than some other GTs — that is, GT3 cars must be based on models in production — there are some significant differences between these two R8s. For example, the racecar's less powerful, per GT3 rules, is two wheel drive, and has just a bit of tubing welded to the insides. And that's not mentioning the gearbox, or the racecar's big-ass ode to Jacob Bernoulli out back.